I think it would greatly help to better understand what it is you are looking to manage here (or what your concerns are). Is there really perennially sensitive information your SMS messages? In my experience, most of them are ephemeral in utility (e.g. an OTP or a reminder).
So two immediate questions arise:
1. Do you have a perceived sense of risk/vulnerability to not deleting SMS messages? Why?
2. Assuming there's something more to cover other than #1, what is the problem you are actually trying to solve here?
So two immediate questions arise:
1. Do you have a perceived sense of risk/vulnerability to not deleting SMS messages? Why?
2. Assuming there's something more to cover other than #1, what is the problem you are actually trying to solve here?